linux-kernel - Re: [PATCH 1/2] mfd: intel-m10-bmc: specify the retimer sub devices

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Message-ID: <20210107041652.GB7750@yilunxu-OptiPlex-7050>
Date:   Thu, 7 Jan 2021 12:16:53 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     arnd@...db.de, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, trix@...hat.com, lgoncalv@...hat.com,
        hao.wu@...el.com, matthew.gerlach@...el.com,
        russell.h.weight@...el.com
Subject: Re: [PATCH 1/2] mfd: intel-m10-bmc: specify the retimer sub devices

On Wed, Jan 06, 2021 at 08:23:30AM +0000, Lee Jones wrote:
> On Wed, 06 Jan 2021, Xu Yilun wrote:
> 
> > The patch specifies the 2 retimer sub devices and their resources in the
> > parent driver's mfd_cell. It also adds the register definition of the
> > retimer sub devices.
> > 
> > There are 2 ethernet retimer chips (C827) connected to the Intel MAX 10
> > BMC. They are managed by the BMC firmware, and host could query them via
> > retimer interfaces (shared registers) on the BMC. The 2 retimers have
> > identical register interfaces in different register addresses or fields,
> > so it is better we define 2 retimer devices and handle them with the same
> > driver.
> > 
> > Signed-off-by: Xu Yilun <yilun.xu@...el.com>
> > ---
> >  drivers/mfd/intel-m10-bmc.c       | 19 ++++++++++++++++++-
> >  include/linux/mfd/intel-m10-bmc.h |  7 +++++++
> >  2 files changed, 25 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/mfd/intel-m10-bmc.c b/drivers/mfd/intel-m10-bmc.c
> > index b84579b..e0a99a0 100644
> > --- a/drivers/mfd/intel-m10-bmc.c
> > +++ b/drivers/mfd/intel-m10-bmc.c
> > @@ -17,9 +17,26 @@ enum m10bmc_type {
> >  	M10_N3000,
> >  };
> >  
> > +static struct resource retimer0_resources[] = {
> > +	{M10BMC_PKVL_A_VER, M10BMC_PKVL_A_VER, "version", IORESOURCE_REG, },
> > +};
> > +
> > +static struct resource retimer1_resources[] = {
> > +	{M10BMC_PKVL_B_VER, M10BMC_PKVL_B_VER, "version", IORESOURCE_REG, },
> > +};
> 
> Please use the DEFINE_RES_*() helpers for this.

Yes, will change it.

Thanks,
Yilun